Vintage Suzanne Kalan Necklace

Vintage Suzanne Kalan chalcedony diamond 18k necklace. The chalcedony is checkerboard cut. The diamonds are light brown with 54 diamonds of approximately .45 carats in round brilliant cut. Diameter of stone 20 mm. Stamped. 18k and makers mark. The chain has a second ring to shorten it but longest length is 17”. The stone is .9” Gorgeous piece! Smoke free environment.